RHSA-2026:54205HighCVSS 8.4

Red Hat Security Advisory: OpenShift Container Platform 4.12.96 bug fix and security update

Published
August 20, 2026
Last Modified
August 26, 2026

🔗 CVE IDs covered (2)

CVE-2025-10263 →CVE-2026-53359 →

📋 Description

CVE-2025-10263 — kernel: Arm Processors: Privilege escalation or information disclosure via writes to higher exception level resources CVE-2026-53359 — kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role

🎯 Affected products2

  • Red Hat OpenShift Container Platform 4.12
  • rhcos-x86_64-412.86.202608080425-0 as a component of Red Hat OpenShift Container Platform 4.12

✅ Remediation

For OpenShift Container Platform 4.12 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.12/html/release_notes You may download the oc tool and use it to inspect release image metadata for x86_64 architecture. The image digest may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags. The sha value for the release is as follows: (For x86_64 architecture) The image digest is sha256:fc0a3dd609a60dd4ad10fe4badef3058d61a1a33436d33ec4b563d5aaf9f26cc All OpenShift Container Platform 4.12 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.12/html-single/updating_clusters/index#updating-cluster-within-minor. Workaround: This vulnerability can be mitigated by disabling nested virtualization. Create a file in `/etc/modprobe.d/` with a descriptive name, such as `cve-2026-53359-mitigation.conf`. In that file, disable nested virtualization for the `kvm_intel` and `kvm_amd` kernel modules: ``` options kvm-intel nested=0 options kvm-amd nested=0 ``` Use `lsmod` to determine if either module is already loaded. If so, remove loaded modules with `modprobe -r`. To validate that nested virtualization is disabled, read the files `/sys/module/kvm_intel/parameters/nested` and `/sys/module/kvm_amd/parameters/nested`. If these modules are loaded, those files should read `N` to indicate that the feature is disabled. In OpenShift 4, a MachineConfig can be utilized to create a modprobe configuration allowing control of the module on applicable nodes. See the following article for an example. https://access.redhat.com/solutions/6979679

🔗 References (5)